U3038 Diagnostic Trouble Code

U3038 is a kind of OBD-II Diagnostic U-Network Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a U3038 diagnostic trouble code may include:

Diminished fuel efficiency
Fuel pressure too high
Malfunction Indicator Lamp (MIL) illuminated
Engine surge

Possible Causes :

Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
An air leak forward of the DPF will change the sensor readings resulting in the code
Faulty IMRC actuator/sensor

Repair Processes :

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness.

Process Tips

Diagnostic trouble code U3038 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before U3038.

Fortunately, U3038 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U3038 Trouble Code For Specific Cars

U3038 Mazda Navajo 2-1 Downshift Error
U3038 Opel Cd Decklid Punch-Out Sensor Battery Short
U3038 Bmw X6 Column Reach Feedback Potentiometer Circuit Short to Ground
U3038 Holden Maloo Power Supply #1 Circuit Short to Ground
U3038 Hyundai Atos Running Board Lamp Circuit Failure
U3038 Toyota 1000 Multi-faults - Bank 2 - With Low Side Shorts
U3038 Holden Hq Power Door Unlock Circuit Failure